Collaborative Research: The Paleocene-Eocene Thermal Maximum in the Southern Ocean: Middle Bathyal Constraints from ODP Sites 689 (Atlantic Sector) and 738 (Indian Sector)

谢伦贝格/凯利摘要PI将进行综合化学地层学、岩石地层学和生态地层学研究，在大西洋、太平洋和更深的南大洋早期研究的背景下，考虑古新世-始新世热最大期的开始和历史。PI已经产生了一个散装碳酸盐稳定同位素记录的两个南大洋网站，证明地层完整的古新世始新世边界在这两个网站。他们建议测试三个问题，并将他们的发现与其他PETM记录联系起来：1）PETM的起始速率是多少，特别是，假设的甲烷释放引发了PETM事件，在大气中氧化并通过海洋逐渐混合？2)碳酸盐饱和度在剖面中是如何变化的，是否有多次甲烷注入？以及3）浮游和底栖生态系统如何通过水文学和浮游-底栖耦合的变化对事件作出反应？将第738和689号站点的结果添加到其他深度剖面中，重点是对古地中海东部过渡期进行高分辨率研究，这将为南大洋较浅的深度提供新的信息。

Schellenberg/KellyAbstractThe PIs will carry out an integrated chemostratigraphic, lithostratigraphic and ecostratigraphic study that will consider the onset and history of the Paleocene-Eocene Thermal Maximum in the context of earlier studies from the Atlantic, Pacific, and deeper Southern Ocean. The PIs have generated a bulk carbonate stable isotope record for two Southern Ocean sites that demonstrates stratigraphic completeness across the Paleocene-Eocene boundary at both sites. They propose to test three questions and relate their findings to other PETM records: 1) what was the rate of onset of the PETM and specifically, did the hypothesized methane release that triggered the PETM event oxidize in the atmosphere and progressively mix downward through the ocean?; 2) how did carbonate saturation change through the section and were there multiple methane injections?, and 3) how did the planktic and benthic ecosystems respond to the event by way of changes in hydrography and planktic-benthic coupling? The addition of Sites 738 and 689 results to other depth transects focused on high-resolution study of the PETM will provide new information for the shallower depths of the Southern Ocean.